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;;; thread-tests.el --- Test suite for thread.el -*- lexical-binding: t; -*-
;; Copyright (C) 2018-2019 Free Software Foundation, Inc.
;; Author: Gemini Lasswell <gazally@runbox.com>
;; Keywords: threads
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'ert)
(require 'thread)
;; Declare the functions used here in case Emacs has been configured
;; --without-threads.
(declare-function make-mutex "thread.c" (&optional name))
(declare-function mutex-lock "thread.c" (mutex))
(declare-function mutex-unlock "thread.c" (mutex))
(declare-function make-thread "thread.c" (function &optional name))
(declare-function thread-join "thread.c" (thread))
(declare-function thread-yield "thread.c" ())
(defvar thread-tests-flag)
(defvar thread-tests-mutex (when (featurep 'threads) (make-mutex "mutex1")))
(defun thread-tests--thread-function ()
(setq thread-tests-flag t)
(with-mutex thread-tests-mutex
(sleep-for 0.01)))
(ert-deftest thread-tests-thread-list-send-error ()
"A thread can be sent an error signal from the *Thread List* buffer."
(skip-unless (featurep 'threads))
(cl-letf (((symbol-function 'y-or-n-p) (lambda (_prompt) t)))
(with-mutex thread-tests-mutex
(setq thread-tests-flag nil)
(let ((thread (make-thread #'thread-tests--thread-function
"thread-tests-wait")))
(while (not thread-tests-flag)
(thread-yield))
(list-threads)
(goto-char (point-min))
(re-search-forward
"^thread-tests.+[[:blank:]]+Blocked[[:blank:]]+.+mutex1.+?")
(thread-list-send-error-signal)
(should-error (thread-join thread))
(list-threads)
(goto-char (point-min))
(should-error (re-search-forward "thread-tests"))))))
(ert-deftest thread-tests-thread-list-show-backtrace ()
"Show a backtrace for another thread from the *Thread List* buffer."
(skip-unless (featurep 'threads))
(let (thread)
(with-mutex thread-tests-mutex
(setq thread-tests-flag nil)
(setq thread
(make-thread #'thread-tests--thread-function "thread-tests-back"))
(while (not thread-tests-flag)
(thread-yield))
(list-threads)
(goto-char (point-min))
(re-search-forward
"^thread-tests.+[[:blank:]]+Blocked[[:blank:]]+.+mutex1.+?")
(thread-list-pop-to-backtrace)
(goto-char (point-min))
(re-search-forward "thread-tests-back")
(re-search-forward "mutex-lock")
(re-search-forward "thread-tests--thread-function"))
(thread-join thread)))
(ert-deftest thread-tests-list-threads-error-when-not-configured ()
"Signal an error running `list-threads' if threads are not configured."
(skip-unless (not (featurep 'threads)))
(should-error (list-threads)))
(provide 'thread-tests)
;;; thread-tests.el ends here
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